Here single Photo view and also Gallery Preview and also Photo view in Gallery follow the same logic: "If height bigger than iwdth let's show it 'Portrait'"
... is not only "title", but also "Caption" with the same text. Here some info concerning Caption and Title!
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Blanks in Captions Stop Caption
Toilettenhäuschen
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[img=https://i0.wp.com/rrbdpublic23.wordpress.com/wp-content/uploads/2024/09/240928_5091c_oelpersee-grillplatz-klohaeuschen_rtr_oelpersee.jpg?w=1680&h=&ssl=1 width=300 title=Toilettenhäuschen am Ölper See Lizenz CC-BY-SA]
Blanks in Caption coded as "unbreakable"
Toilettenhäuschen am Ölper See, Lizenz CC-BY-SA
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Unfortunately the code will be shown as Blank, not as it's code
Blanks in Caption from LibreOffice as "unbreakable"
Toilettenhäuschen am Ölper See, Lizenz
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[img=https://i0.wp.com/rrbdpublic23.wordpress.com/wp-content/uploads/2024/09/240928_5091c_oelpersee-grillplatz-klohaeuschen_rtr_oelpersee.jpg?w=1680&h=&ssl=1 width=300 title=Toilettenhäuschen am Öpler See, Lizenz CC-BY-SA]
In older versions
FP 1.3.1
"Title" indeed only created Title for the image, not a caption